As part of the 1.43 update, we introduced new level of support for the controller in the game UI. Unfortunately, due to our mistake, the Steam Input configuration files were not properly updated and required manual update from our players.
The fix for this just rolled out, but it will reset Steam Input configurations for those of you who already did it manually and made some custom changes for the configuration since the 1.43 update. This fix doesn't require any game update but we advise restarting the Steam client to automatically get the configuration change from Steam's servers. We are sorry for the inconvenience!
Now, go enjoy the Christmas event! ːwinter2019happyyulː
https://steamcommunity.com/games/227300/announcements/detail/5973460047022476916